C# | Graphics.DrawLine() Method | Set – 2

Graphics.DrawLine() Method is used to draw a line connecting the two points specified by the coordinate pairs. There are 4 methods in the overload list of this method as follows:

  • DrawLine(Pen, PointF, PointF) Method
  • DrawLine(Pen, Int32, Int32, Int32, Int32) Method
  • DrawLine(Pen, Single, Single, Single, Single) Method
  • DrawLine(Pen, Point, Point) Method

First, two methods are already discussed in Set – 1. Here, we will discuss the last two methods.



DrawLine(Pen, Single, Single, Single, Single) Method

This method is used to draw line form a specified set of coordinates given in form x1, y1, x2, y2 all discrete.

Syntax:

public void DrawLine (System.Drawing.Pen pen, float x1, float y1, float x2, float y2);

Parameters:

  • pen: Pen determines the color, width, and style of the line.
  • x1: The abscissa of first point.
  • y1: The ordinate of first point.
  • x2: The abscissa of second point.
  • y2: The ordinate of second point.

Exception: This method will give ArgumentNullException if the pen is null.

Example:

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// C# program to illustrate the use of 
using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
  
namespace GFG {
  
class PrintableForm : Form {
  
    // Main Method
    public static void Main()
    {
        Application.Run(new PrintableForm());
    }
  
    public PrintableForm()
    {
        ResizeRedraw = true;
    }
  
    protected override void OnPaint(PaintEventArgs pea)
    {
        // Defines the Pen
        Pen pen = new Pen(ForeColor);
  
        // x1 = 30
        // y1 = 30
        // x2 = 200
        // y2 = 300
          
        // using the Method
        pea.Graphics.DrawLine(pen, 30.0F, 30.0F, 200.0f, 300.0f);
    }
}
}

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Output:

DrawLine(Pen, Point, Point)

This method is used to draw a line from a specified set of points to a specified set of points. It needs a Point variable which is set of (x, y) points.

Syntax:


public void DrawLine (System.Drawing.Pen pen, System.Drawing.PointF pt1, System.Drawing.PointF pt2);

Parameters:

  • pen: Pen determines the color, width, and style of the line.
  • pt1: Defines the (x, y) coordinates as a Point variable of the initial point.
  • pt2: Defines the (x, y) coordinates as a Point variable of the final point.

Exception: This method will give ArgumentNullException if the pen is null.

Example:

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// C# program to demonstrate the use of
// DrawLine(Pen, Point, Point) Method
using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
  
namespace GFG {
  
class PrintableForm : Form {
  
    // Main Method
    public static void Main()
    {
        Application.Run(new PrintableForm());
    }
  
    public PrintableForm()
    {
        ResizeRedraw = true;
    }
  
    protected override void OnPaint(PaintEventArgs pea)
    {
        // Defines pen
        Pen pen = new Pen(ForeColor);
  
        // Defines the both points to connect
        // pt1 is (30, 30) which represents (x1, y1)
        Point pt1 = new Point(30, 30);
  
        // pt1 is (200, 300) which represents (x2, y2)
        Point pt2 = new Point(200, 300);
  
        // Draws the line
        pea.Graphics.DrawLine(pen, pt1, pt2);
    }
}
}

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Output:



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